finfo_file

finfo::file

(PHP >= 5.3.0, PHP 7, PHP 8, PECL fileinfo >= 0.1.0)

finfo_file -- finfo::file — Bir dosya hakkında bilgi döndürür

Açıklama

Yordamsal kullanım

finfo_file(
    finfo $finfo,
    string $filename,
    int $flags = FILEINFO_NONE,
    ?resource $context = null
): string|false

Nesne yönelimli kullanım

public finfo::file(string $filename, int $flags = FILEINFO_NONE, ?resource $context = null): string|false

Bu işlev bir dosya hakkında bilgi edinmek için kullanılır.

Bağımsız Değişkenler

finfo: finfo_open() işlevinden dönen finfo nesnesi.
filename: Hakkında bilgi istenen dosya.
flags: Fileinfo sabitlerinden biri veya bir kaçının birleşimi.
context: Akımlar hakkında bilgi edinmek için Akım İşlevleri bölümüne bakınız.

Dönen Değerler

Bir hata oluşmuşsa false, aksi takdirde belirtilen dosyanın içeriği hakkında açıklama dizgesi döner.

Sürüm Bilgisi

Sürüm:	Açıklama
8.1.0	`finfo` bağımsız değişkeni artık finfo nesnesi kabul ediyor, evvelce bir finfo özkaynağı kabul ederdi.
8.0.0	`context` artık `null` olabiliyor.

Örnekler

Örnek 1 - finfo_file() örneği

<?php
// Bir açıklama değil MIME türü dönsün
$finfo = finfo_open(FILEINFO_MIME_TYPE);

foreach (glob("*") as $dosya) {
    echo finfo_file($finfo, $dosya) . "\n";
}

finfo_close($finfo);
?>

Yukarıdaki örnek şuna benzer bir çıktı üretir:

text/html
image/gif
application/vnd.ms-excel

Ayrıca Bakınız

finfo_buffer() - Bir dizge tamponu hakkında bilgi döndürür

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User Contributed Notes 12 notes

down

Schraalhans Keukenmeester ¶

17 years ago

Tempting as it may seem to use finfo_file() to validate uploaded image files (Check whether a supposed imagefile really contains an image), the results cannot be trusted. It's not that hard to wrap harmful executable code in a file identified as a GIF for instance.

A better & safer option is to check the result of:

if (!$img = @imagecreatefromgif($uploadedfilename)) {
  trigger_error('Not a GIF image!',E_USER_WARNING);
  // do necessary stuff
}

down

66Ton99 at gmail dot com ¶

8 years ago

The way HOWTO get MIME-type of remote file.

<?php
class MimeStreamWrapper
{
    const WRAPPER_NAME = 'mime';
    public $context;
    private static $isRegistered = false;
    private $callBackFunction;
    private $eof = false;
    private $fp;
    private $path;
    private $fileStat;
    private function getStat()
    {
        if ($fStat = fstat($this->fp)) {
            return $fStat;
        }

        $size = 100;
        if ($headers = get_headers($this->path, true)) {
            $head = array_change_key_case($headers, CASE_LOWER);
            $size = (int)$head['content-length'];
        }
        $blocks = ceil($size / 512);
        return array(
            'dev' => 16777220,
            'ino' => 15764,
            'mode' => 33188,
            'nlink' => 1,
            'uid' => 10000,
            'gid' => 80,
            'rdev' => 0,
            'size' => $size,
            'atime' => 0,
            'mtime' => 0,
            'ctime' => 0,
            'blksize' => 4096,
            'blocks' => $blocks,
        );
    }
    public function setPath($path)
    {
        $this->path = $path;
        $this->fp = fopen($this->path, 'rb') or die('Cannot open file:  ' . $this->path);
        $this->fileStat = $this->getStat();
    }
    public function read($count) {
        return fread($this->fp, $count);
    }
    public function getStreamPath()
    {
        return str_replace(array('ftp://', 'http://', 'https://'), self::WRAPPER_NAME . '://', $this->path);
    }
    public function getContext()
    {
        if (!self::$isRegistered) {
            stream_wrapper_register(self::WRAPPER_NAME, get_class());
            self::$isRegistered = true;
        }
        return stream_context_create(
            array(
                self::WRAPPER_NAME => array(
                    'cb' => array($this, 'read'),
                    'fileStat' => $this->fileStat,
                )
            )
        );
    }
    public function stream_open($path, $mode, $options, &$opened_path)
    {
        if (!preg_match('/^r[bt]?$/', $mode) || !$this->context) {
            return false;
        }
        $opt = stream_context_get_options($this->context);
        if (!is_array($opt[self::WRAPPER_NAME]) ||
            !isset($opt[self::WRAPPER_NAME]['cb']) ||
            !is_callable($opt[self::WRAPPER_NAME]['cb'])
        ) {
            return false;
        }
        $this->callBackFunction = $opt[self::WRAPPER_NAME]['cb'];
        $this->fileStat = $opt[self::WRAPPER_NAME]['fileStat'];

        return true;
    }
    public function stream_read($count)
    {
        if ($this->eof || !$count) {
            return '';
        }
        if (($s = call_user_func($this->callBackFunction, $count)) == '') {
            $this->eof = true;
        }
        return $s;
    }
    public function stream_eof()
    {
        return $this->eof;
    }
    public function stream_stat()
    {
        return $this->fileStat;
    }
    public function stream_cast($castAs)
    {
        $read = null;
        $write  = null;
        $except = null;
        return @stream_select($read, $write, $except, $castAs);
    }
}
$path = 'http://fc04.deviantart.net/fs71/f/2010/227/4/6/PNG_Test_by_Destron23.png';
echo "File: ", $path, "\n";
$wrapper = new MimeStreamWrapper();
$wrapper->setPath($path);

$fInfo = new finfo(FILEINFO_MIME);
echo "MIME-type: ", $fInfo->file($wrapper->getStreamPath(), FILEINFO_MIME_TYPE, $wrapper->getContext()), "\n";
?>

down

tim at savaslabs dot com ¶

9 years ago

Just noting (because I ran into it!) that the current implementation of finfo_file has a known bug which causes PHP to allocate huge amounts of memory when certain strings are present in text files that it is examining.

See https://bugs.php.net/bug.php?id=69224 for more info.

down

contato at vfreitas dot com ¶

12 years ago

Well, i have a great probleam with that, MS Office 2007 extensions (pptx, xlsx, docx) do not have a default Mime type, they have "application/zip" mime type, so, to fix that, i do one little function to verify the extension.
That function allow's you to be safe of fake extensions hack.

<?php

$arrayZips = array("application/zip", "application/x-zip", "application/x-zip-compressed");

$arrayExtensions = array(".pptx", ".docx", ".dotx", ".xlsx");

$file = 'path/to/file.xlsx';

$original_extension = (false === $pos = strrpos($file, '.')) ? '' : substr($file, $pos);

$finfo = new finfo(FILEINFO_MIME);

$type = $finfo->file($file);

if (in_array($type, $arrayZips) && in_array($original_extension, $arrayExtensions))
{
   return $original_extension;
}

?>

down

Zane MegaLab.it ¶

13 years ago

I was getting application/octet-stream or "<= not supported" for all the files.

I found out that in PHP 5.3 the magic file is built-in into PHP and that is what should be used. The magic file found on the system may not always be what libmagic expects, hence the error.

down

darko at uvcms dot com ¶

16 years ago

Another interresting feature of finfo_file on Windows.

This function can return empty string instead of FALSE for some file types (ppt for example). Therefore to be sure do a triple check of output result and provide default type just in case. Here is a sample code:

$ftype = 'application/octet-stream';
$finfo = @finfo_open(FILEINFO_MIME);
if ($finfo !== FALSE) {
   $fres = @finfo_file($finfo, $file);
   if ( ($fres !== FALSE) 
        && is_string($fres) 
        && (strlen($fres)>0)) {
            $ftype = $fres;
        }
   @finfo_close($finfo);
}

down

niko dot jokipalo at gmail dot com ¶

10 years ago

I spent days looking and searching for a database with actual plain language descriptions for the media types, for example
finfo(.png) --> "image/png" --> "PNG image".
In Ubuntu based OS's you can find already translated database at /usr/share/mime

http://manpages.ubuntu.com/manpages/hardy/en/man5/gnome-mime.5.html

down

darko at uvcms dot com ¶

16 years ago

OO (bit improved) version of the same thing



<?php

$file = '<somefile>';

$ftype = 'application/octet-stream';

$finfo = @new finfo(FILEINFO_MIME);

$fres = @$finfo->file($file);

if (is_string($fres) && !empty($fres)) {

   $ftype = $fres;

}

?>

down

jesen at protonmail dot com ¶

11 days ago

When using `finfo_file()`, you may encounter results similar to the following, which require attention: `image/png; charset=binary`

down

powtac at gmx dot de ¶

8 years ago

Be careful, files with BOM will not detected correctly!

down

-2

scott at thebrain dot ca ¶

15 years ago

I thought to use fileinfo to check if a file was gzip or bzip2. However, the mime type of a compressed file is "data" because compression is an encoding rather than a type.



gzip files begin with binary 1f8b.

bzip2 files begin with magic bytes 'B'  'Z'  'h'.

e.g.



<?php

$s = file_get_contents("somefilepath");

if ( bin2hex(substr($s,0,2)) == '1f8b' ) {/* could be a gzip file */}

if( substr($s,0,3) == 'BZh' ){/* could be a bzip2 file */}

?>



I am not an encoding expert. My only testing was using a few of my own encoded files.

down

-4

da_kooz at hotmail dot com ¶

11 years ago

Here is an wrapper that will properly identify Microsoft Office 2007 documents. It's trivial and straightforward to use, edit, and to add more file extentions/mimetypes.

<?php
function get_mimetype($filepath) {
    if(!preg_match('/\.[^\/\\\\]+$/',$filepath)) {
        return finfo_file(finfo_open(FILEINFO_MIME_TYPE), $filepath);
    }
    switch(strtolower(preg_replace('/^.*\./','',$filepath))) {
        // START MS Office 2007 Docs
        case 'docx':
            return 'application/vnd.openxmlformats-officedocument.wordprocessingml.document';
        case 'docm':
            return 'application/vnd.ms-word.document.macroEnabled.12';
        case 'dotx':
            return 'application/vnd.openxmlformats-officedocument.wordprocessingml.template';
        case 'dotm':
            return 'application/vnd.ms-word.template.macroEnabled.12';
        case 'xlsx':
            return 'application/vnd.openxmlformats-officedocument.spreadsheetml.sheet';
        case 'xlsm':
            return 'application/vnd.ms-excel.sheet.macroEnabled.12';
        case 'xltx':
            return 'application/vnd.openxmlformats-officedocument.spreadsheetml.template';
        case 'xltm':
            return 'application/vnd.ms-excel.template.macroEnabled.12';
        case 'xlsb':
            return 'application/vnd.ms-excel.sheet.binary.macroEnabled.12';
        case 'xlam':
            return 'application/vnd.ms-excel.addin.macroEnabled.12';
        case 'pptx':
            return 'application/vnd.openxmlformats-officedocument.presentationml.presentation';
        case 'pptm':
            return 'application/vnd.ms-powerpoint.presentation.macroEnabled.12';
        case 'ppsx':
            return 'application/vnd.openxmlformats-officedocument.presentationml.slideshow';
        case 'ppsm':
            return 'application/vnd.ms-powerpoint.slideshow.macroEnabled.12';
        case 'potx':
            return 'application/vnd.openxmlformats-officedocument.presentationml.template';
        case 'potm':
            return 'application/vnd.ms-powerpoint.template.macroEnabled.12';
        case 'ppam':
            return 'application/vnd.ms-powerpoint.addin.macroEnabled.12';
        case 'sldx':
            return 'application/vnd.openxmlformats-officedocument.presentationml.slide';
        case 'sldm':
            return 'application/vnd.ms-powerpoint.slide.macroEnabled.12';
        case 'one':
            return 'application/msonenote';
        case 'onetoc2':
            return 'application/msonenote';
        case 'onetmp':
            return 'application/msonenote';
        case 'onepkg':
            return 'application/msonenote';
        case 'thmx':
            return 'application/vnd.ms-officetheme';
            //END MS Office 2007 Docs

    }
    return finfo_file(finfo_open(FILEINFO_MIME_TYPE), $filepath);
}

?>

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